DESKTOP-ESBC3OR_20200903-蒋生桃

问题

            Comparator<Customer> comparator = new Comparator<Customer>() {
            @Override
            public int compare(Customer o1, Customer o2) {
                // The operator > is undefined for the argument type(s) java.time.LocalDate, java.time.LocalDate
                if (o1.getBirthdate() > o2.getBirthdate() ) {
                    return -1;
                } else if (o1.getBirthdate() == o2.getBirthdate()) {
                    return 0;
                } else {
                    return 1;
                }
            }
        };

为什么o1.getBirthdate() > o2.getBirthdate()编译错误？

解决

因为getBirthdate()获取的是年、月、日，不能直接用 > 比较

应该用以下比较方法

            Comparator<Customer> comparator = new Comparator<Customer>() {
            @Override
            public int compare(Customer o1, Customer o2) {
                if (o1.getBirthdate().isAfter(o2.getBirthdate())) {
                    return -1;
                } else if (o1.getBirthdate() == o2.getBirthdate()) {
                    return 0;
                } else {
                    return 1;
                }
            }
        };

吐槽

爱护自己，不要感冒